Mass Driver
Technodem knew that demons would just LOVE railguns and gauss rifles, especially if he offered upgrades for existing weapons that he was already making a fortune on. But, per usual, he needed some way to break the ice. The Mass Driver is, at first glance, the cheapest and crappiest rail gun anyone would get. It doesn't even have any existing ammo clips. But it's redeeming factor is this: anything can be fired from it. Rocks, sticks, shards of glass, bullets... anything a demon might have can be shot from the adjustable nozzle. It basically has unlimited cheap ammo. The weapon was an incredible success, so much of a success that a railgun usually means a "mass driver" to demons, and demons are very disappointed in railguns that only take one type or a few types of slugs. They are also now used to a much cheaper price for railguns than is economically viable.